Add unit test for (to be added) Net_SFTP_Stream::register().
Add Net_SFTP_Stream::register() for easier autoloading.
Use get_called_class() if available.
Merge pull request #393 from bantu/stream-registration

Add Net_SFTP_Stream::register()

* bantu/stream-registration:
  Use get_called_class() if available.
  Add Net_SFTP_Stream::register() for easier autoloading.
  Add unit test for (to be added) Net_SFTP_Stream::register().